Entity Framework Subtract Two Dates

How to subtract two dates?

How to determine the number of days between 2 dates using LINQ with Entity Framework? Let's take a look at a very simple example where we want to retrieve all those orders which are placed in the last 100 days.

using (var ctx = new MyContext())
{
    int noOfDays = 30;
    var orders = context.Invoices
        .Where(i => DateTime.Now.Subtract(s.Date).TotalDays > noOfDays)
        .ToList();
}

when you execute the above code, then it will throw the following exception.

System.NotSupportedException: LINQ to Entities does not recognize the method 'System.TimeSpan Subtract(System.DateTime)' method, and this method cannot be translated into a store expression.

StackOverflow Related Questions

• LINQ to Entities for subtracting 2 dates

Answer

The easiet way to subtract two dates using LINQ is to define a DateTime variable that represents the old date, then use that DateTime variable in where portion of the LINQ query.

using (var context = new EntityContext())
{	
	int noOfDays = 30;
	DateTime oldDate = DateTime.Now.Subtract(new TimeSpan(noOfDays, 0, 0, 0, 0));

	var invoices = context.Invoices
 		.Where(i => i.Date > oldDate)
 		.ToList();
}

Try it online